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Note 16 - Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Pretax
    
Tax
Effect
    
After-tax
  
Affected Line Item
in Consolidated
Statements of
Income
                           
Balance as of June 30, 2016
  
$
3,621
    
$
(1,232
)
  
$
2,389
  
 
Unrealized holding loss on available-for-sale securities arising during the period
    
(2,737
)
    
931
      
(1,806
)
 
Amounts reclassified from accumulated other comprehensive income
    
(209
)
    
71
      
(138
)
(a)(b)
Net current period other comprehensive loss
    
(2,946
)
    
1,002
      
(1,944
)
 
Balance as of June 30, 2017
  
$
675
    
$
(230
)
  
$
445
  
 
Unrealized holding loss on available-for-sale securities arising during the period
    
(2,711
)
    
638
      
(2,073
)
 
Amounts reclassified from accumulated other comprehensive income
    
(33
)
    
12
      
(21
)
(a)(b)
Net current period other comprehensive loss
    
(2,744
)
    
650
      
(2,094
)
 
Reclassification of disproportional tax effect
    
—
      
14
      
14
  
 
Balance as of June 30, 2018
  
$
(2,069
)
  
$
434
    
$
(1,635
)